表面粗糙度是一种()几何形状误差,也称为()不平度。
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______you return the dictionary to the library immediately, you will be fined.
A. If
B. Until
C. Provided
D. Unless
______difficulties they may come across, they will help one another to get over them.
A. However
B. Whatever
C. Whichever
D. Since
______he had a knowledge of Spanish, he still attended the training course.
A. But for
B. So long as
C. Although
D. In spite
It is almost impossible for me to meet her_____she really comes to see me.
A. for fear that
B. lest
C. unless
D. provided that